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UNITED NATIONS (AP) — The Paris Agreement to combat climate change became international law on Friday — a landmark deal about tackling global warming amid growing fears that the world is becoming hotter even faster than scientists expected.

So far, 96 countries, accounting for just over two-thirds of the world’s greenhouse gas emissions, have formally joined the accord, which seeks to limit global warming to 2 degrees Celsius (3.6 degrees Fahrenheit). More countries are expected to come aboard in the coming weeks and months.

Secretary General Ban-Ki moon commemorated the event, talking with civil society groups at U.N. headquarters in New York to hear their concerns and visions for the future.

“Today we make history in humankind’s efforts to combat climate change,” Ban said before opening the meeting.

He praised the civil groups for mobilizing hundreds of millions of people to back fighting climate change, but warned the outcome remained uncertain.

“We are still in a race against time. We need to transition to a low-emissions and climate-resilient future,” Ban said. “Now is the time to strengthen global resolve, do what science demands and seize the opportunity to build a safer more sustainable world for all.”

Scientists praised the speed at which the agreement, signed by over 190 parties last December in Paris, has come into force, saying it underscores a new commitment by the international community to address the problem which is melting polar ice caps, sending sea levels rising and transforming vast swaths of arable land into desert.

But environmentalists say the agreement is just the first step of a much longer and complicated process of transitioning away from fossil fuels, which currently supply the bulk of the planet’s energy needs and also are the primary drivers of global warming.

Naomi Ages, climate liability project lead at Greenpeace, said that it was up to civil society groups to hold governments and corporations responsible.

“We know that existing fossil fuel projects will push us past 2 degrees, so we’re mobilizing around the world to keep it in the ground and stop development of new fossil fuel projects,” Ages said.

While the Paris agreement is legally binding, the emissions reductions that each country has committed to are not. Instead, the agreement seeks to create a transparent system that will allow the public to monitor how well each country is doing in meeting its goals in hopes that this will motivate them to transition more quickly to clean, renewable energy like wind, solar and hydropower.

The agreement also requires governments to develop climate action plans that will be periodically revised and replaced with new, even more ambitious, plans. Many of these details will begin to be addressed at the COP22 climate change meeting that begins next week in Marrakech, Morocco.